AMP message - nobody available to pick your call...

in my config i use call group; but anyway, sometimes call not processing by system (for example after reloading, sip peer not up and cannot send call to my phone). then i hear message from AMP: nobody available to pick your call...

it is not bug.

but very good idea is to use option noanswer in playback:

playback(no-body-available|noanswer)

then it will not cause phone answer on incoming call and will not charge caller.